Envelop.



'J. PARBEL.

ENVELOP.

APPLIOATION FILED DEC. 13, 1909.

981,107. Patented Jan. 10, 1911.

JosEPh Par/gel ,m: NORRIS Fem-R's ca'.. wnsumanm. n. c

JOSEPH 1911312131., or MUSKEGON, MICHIGAN.

nnvnnor.

Specification of Letters Patent.

Application filed December 13, 1909.

Patented Jan. 10, 1911.

Serial No. 532,970.

To all whom it may concern:

Be it known that I, JOSEPH PARBEL, 'a citizen of the United States, residing at Muskegon, in the county of Muskegon and State of Michigan, have invented certain new and useful Improvements in Envelope, of which the following is a specification.

My invention relates to improvements in envelops for carrying letters through the mails, and its object is to provide a means whereby a letter cannot be opened and tampered with without easy detection. I attain this result by the construction shown in the accompanying drawing, in which Figure 1 is a plan of the folded, side of an envelop showing the manner of arranging the sealing fold of the envelop to meet the object of my invention. Fig. 2 is the same with the parted slip in the fold shown as being passed back of the lower fold in position to be secured to the surface of a fold of the inclosed letter, and Fig. 3 is a sectional view of an envelop, on the line as w of Fig. 2, with a letter inclosed and the sealing fold of the envelop provided with a slip out in the sealing fold and passed inside of the lower fold and sealed to the surface of a letter, and the main portion of the sealing fold sealed to the outer surface of the lower and end folds.

Similar letters refer to similar parts throughout the several views.

In the manufacture of envelops of this character, the stock is cut with a lower fold, and two end folds, which are sealed together at the time the envelop is made, and an outer or sealing fold that is prepared for sealing, but is not sealed until so desired for mailing purposes. When so formed it is a simple matter to open the envelop and remove the letter without danger of the act being detected. To avert this danger I out two slits, as Z), near the center of the edge of the outside fold and so arrange it that the portion between these slits may be folded and passed inside of the lower fold C, as indicated at B, and sealed to the surface of the letter D, as indicated in Fig. 3, while the outer or sealing fold B is sealed to the outside surfaee of the end folds A of the envelop A so that a letter properly sealed in this envelop cannot be removed without first freeing the letter from the portion of the fold between the slits b, and to accomplish this the letter and the envelop must, both, be more or less mutilated, thus leaving marks whereby the opening of the envelop may be readily detected, elther upon the envelop or the letter or both.

I aim to make this envelop so that no additional material will be required to manufacture it, and, practically, no additional labor, over that required for the manufacture of an ordinary envelop, and, at the same time, to provide an envelop that may be sealed as readily as an ordinary envelop, and that, when sealed, it is not only sealed to itself in the ordinary way, but is, also, sealed to the contents of the envelop so that it cannot possibly be tampered with without ready detection.

' What I claim as new, and desire to secure by Letters Patent of the United States, is:

An ordinary mailing envelop having lower and end folds sealed together, and an open sealing fold forming an ordinary complete let ter envelop, and a narrow fold formed by making two incisions in the edge of the sealing fold, into which the upper edge of the lower folds at the center of the envelop may pass, so that the body of the open fold may be sealed to the outside of the lower" folds and the narrow fold from the open fold may be passed inside of the lower fold and be sealed to the contents of the envelop without adhering to the lower folds.

Signed at Muskegon Michigan November 1909.

J OSEPH- PARBEL. In presence of- JENNIE BERGREN, MATTIE ,FLIGKEMS. 

